Nanoscale ordered architectural growth of second order non linear optical materials
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CARIATI, Elena, LUCENTI, Elena, MARINOTTO, D., RIGONI, Ugo. Nanoscale ordered architectural growth of second order non linear optical materials. In: Materials Science and Condensed Matter Physics, Ed. 8-th Edition, 12-16 septembrie 2016, Chişinău. Chişinău: Institutul de Fizică Aplicată, 2016, Editia 8, p. 116. ISBN 978-9975-9787-1-2.
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Materials Science and Condensed Matter Physics
Editia 8, 2016
Conferința "International Conference on Materials Science and Condensed Matter Physics"
8-th Edition, Chişinău, Moldova, 12-16 septembrie 2016

Nanoscale ordered architectural growth of second order non linear optical materials


Pag. 116-116

Cariati Elena12, Lucenti Elena23, Marinotto D.1, Rigoni Ugo1
 
1 University of Milan,
2 INSTM-UdR Milano,
3 ISTM-CNR, Istituto di Scienze e Tecnologie Molecolari
 
Disponibil în IBN: 22 iulie 2019


Rezumat

Organic and hybrid inorganic–organic nanostructured materials based on molecular NLO-phores characterized by a large quadratic hyperpolarizability (-) have been widely investigated for their potential application in various electro-optical devices. Large (2) values can be obtained starting from molecular materials with high β as building blocks by engineering their nano-organization in a non-centrosymmetric way. Such organization has been efficiently pursued following different approaches such as stepwise construction of multilayers, chirality to induce acentric crystalline structures, ordered inclusion in 1D or 2D host structures, self-assembly in layered crystalline structures and electrical poling of composite polymeric films. This lecture will present the evolution of our research on second order NLO materials following these two latter strategies. In particular, we have developed a direct procedure based on a successful two-step orientation process (electric poling followed by thermal annealing) which produces in-situ oriented dipolar nanocrystals of ionic organic ([DAMS][p-toluenesulfonate], hereafter DAST where DAMS is (E)-N,N-dimethylamino-N’-methylstilbazolium),1 or hybrid inorganic-organic ([DAMS][Cu5I6], hereafter 1)2 homogeneously dispersed in a poly(methyl methacrylate) (PMMA) film. As a further improvement, we have found a simpler processing in combination with a persistent orientation. In fact, oriented dipolar acentric nanocrystals of DAST embedded in PMMA were grown on Indium Tin Oxide (ITO) substrate by solely thermal annealing without electrical poling thanks to an induction effect due to the ITO surface polarity.3 Similarly, we have demonstrated a sequential layer-by-layer path to prepare neat films of 1 through a self-recognition process in the solid state between the first CuI layer and the successive [DAMS]I layer.4 A persistent non-linear optical behavior, typical of oriented films is consequently accessible on different substrates without electrical bias poling through the excellent self-recognition of dipoles aligned along the z-axis